no you should not need too remobe the carpet if it likes most fords,should be two blots under the base of seat will take tow mins to do,and the upper part of the rear seat should be a couple of bolts two at back the of the seat,easy to see with the boot open.

The front seats should be 10mm bolts which you should be able to undo with a socket,or you might be able to undo them from undernaeth,its normally a piss easy job or it is or a orion or escort so thinking the sapph would be the same Luke

Sure someone will who has taken a sapph interior out will be along shortly